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    Litmus outage history

    50 recorded Litmus incidents since March 2023, with official updates, affected components, duration and resolution information.

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    Builder documents not loading when Partials are present

    Started April 17, 2026 at 3:37 PM UTC · 1h 20m

    OutageMajor incident
    Affected components
    Litmus Application
    1. April 17, 2026 at 3:37 PM UTCidentified

      We've identified an issue where Builder documents taking advantage of Partials are not loading. Our team is working to implement a solution as soon as possible.

    2. April 17, 2026 at 4:12 PM UTCidentified

      Our team is continuing to work on a fix. We have identified the root cause and are actively implementing a solution.

    3. April 17, 2026 at 4:56 PM UTCresolved

      This issue has been resolved.

    Litmus application unavailable

    Started November 3, 2025 at 2:15 PM UTC · 6h 31m

    OutageMajor incident
    Affected components
    Litmus Application
    1. November 3, 2025 at 2:15 PM UTCinvestigating

      We are currently investigating the issue and will provide an update as soon as possible.

    2. November 3, 2025 at 2:38 PM UTCmonitoring

      The application is now available again and our engineering team is monitoring the situation.

    3. November 3, 2025 at 4:02 PM UTCmonitoring

      We are continuing to monitor for any further issues.

    4. November 3, 2025 at 8:46 PM UTCresolved

      This issue has been resolved.

    Application unavailable

    Started November 3, 2025 at 7:47 AM UTC · 3h 0m

    OutageCritical incident
    Affected components
    Litmus Application
    1. November 3, 2025 at 7:47 AM UTCinvestigating

      We are currently investigating this issue.

    2. November 3, 2025 at 9:24 AM UTCmonitoring

      The application is now available, our engineering team is monitoring.

    3. November 3, 2025 at 10:47 AM UTCresolved

      This incident has been resolved.

    Multiple failures due to upstream service provider

    Started October 20, 2025 at 9:58 AM UTC · 1d 4h

    OutageMajor incident
    Affected components
    Outlook Dark (Android 11)Outlook for Windows Dark (Windows 11)AOL Mail (Chrome)GMX.de (Chrome)Outlook App (iOS 18)Outlook 2021 (Windows 10)iPhone 15 Plus Dark (iOS 17)Gmail App Dark (Android 11)IBM Notes 10 (Windows 10)Outlook 2019 120 DPI (Windows 10)Apple Mail 16 Dark (macOS 13)Mail.ru (Chrome)Litmus ApplicationColor Blindness (Simulated)Web.de (Chrome)Outlook.com (Chrome)Apple Mail 16 (macOS 13)iPhone 17 Pro (iOS 26)Mail.ru (Edge)iPhone 16 Pro Dark (iOS 18)Outlook for Windows (Windows 11)Gmail App Dark (Android 13)AOL Mail (Edge)Gmail (Chrome)Gmail App (Android 11)T-Online.de (Chrome)GMX.de (Edge)Yahoo Mail (Chrome)Outlook App Dark (iOS 18)Office 365 (Firefox)Mail.ru (Firefox)iPhone 17 Dark (iOS 26)iPhone 17 (iOS 26)iPad mini (Gen 6) Dark (iOS 18)Outlook.com (Firefox)Outlook 2016 120 DPI (Windows 10)iPad (Gen 10) Dark (iOS 18)Outlook 2007 (Windows 10)iPhone 16 Pro Max Dark (iOS 18)IBM Notes 9 (Windows 10)G Suite (Firefox)iPad Pro (12.9 inch) Dark (iOS 18)iPhone 16 Dark (iOS 18)Outlook.com Dark (Chrome)iPhone 16 Plus (iOS 18)Outlook.com Dark (Firefox)Office 365 (Edge)OL Office 365 120 DPI Dark (Windows 10)iPhone SE (3rd Generation) Dark (iOS 18)Gmail App (Android 13)iPhone 15 Plus (iOS 17)T-Online.de (Firefox)Thunderbird 60 (Windows 10)Outlook.com (Edge)Outlook for Mac Dark (macOS 15)Outlook 2021 Dark (Windows 10)G Suite (Chrome)Outlook for Mac (macOS 15)Gmail App Dark (iOS 18)iPad Pro (11 inch) (iOS 18)G Suite (Edge)iPhone 17 Pro Dark (iOS 26)GMX.de (Firefox)iPhone 14 Pro Max Dark (iOS 16)Outlook 2013 (Windows 10)Outlook 2019 (Windows 10)iPad mini (Gen 6) (iOS 18)iPad (Gen 9) (iOS 18)Web.de (Edge)iPhone 14 Pro Max (iOS 16)OL Office 365 (Windows 10)iPhone 14 Dark (iOS 16)Yahoo! Mail (Edge)Plain Text (Text-only view)Gmail App (iOS 18)Outlook 2021 120 DPI (Windows 10)Outlook (Android 11)iPad Pro (11 inch) Dark (iOS 18)Email AnalyticsOutlook 2013 120 DPI (Windows 10)T-Online.de (Edge)iPhone 14 (iOS 16)iPhone SE (3rd Generation) (iOS 18)iPhone 15 Dark (iOS 17)Outlook 2010 (Windows 10)Outlook 2016 (Windows 10)iPhone 16 Pro Max (iOS 18)iPad (Gen 9) Dark (iOS 18)iPhone 16 Pro (iOS 18)iPhone 16 Plus Dark (iOS 18)iPhone 16 (iOS 18)Gmail (Edge)OL Office 365 Dark (Windows 10)iPhone 15 (iOS 17)iPad Pro (12.9 inch) (iOS 18)OL Office 365 120 DPI (Windows 10)Office 365 (Chrome)Web.de (Firefox)iPad (Gen 10) (iOS 18)
    1. October 20, 2025 at 9:58 AM UTCmonitoring

      An upstream service provider has been experiencing problems since 08:11 UTC affecting some features. Their services are now recovering. We're monitoring for residual problems.

    2. October 20, 2025 at 9:58 AM UTCmonitoring

      We are continuing to monitor for any further issues.

    3. October 20, 2025 at 1:21 PM UTCidentified

      The upstream service provider issues are ongoing and affecting multiple other services, such as Litmus Previews and Litmus Analytics. We are attempting to fix the issue and are working with the service provider to restore functionality.

    4. October 20, 2025 at 10:43 PM UTCmonitoring

      The upstream service provider issues have resolved. We're monitoring for any residual issues.

    5. October 21, 2025 at 2:07 PM UTCresolved

      These issues have been resolved.

    Yahoo! Mail Chrome email previews temporarily unavailable

    Started July 25, 2025 at 8:28 PM UTC · 11d 18h

    OutageMajor incident
    Affected components
    Yahoo Mail (Chrome)
    1. July 25, 2025 at 8:28 PM UTCinvestigating

      We are currently investigating this issue.

    2. August 6, 2025 at 3:26 PM UTCresolved

      This incident has been resolved.

    Unable to send/share emails via Litmus Builder

    Started May 5, 2025 at 8:36 PM UTC · 1d 1h

    OutageMajor incident
    Affected components
    Litmus Application
    1. May 5, 2025 at 8:36 PM UTCinvestigating

      We are currently investigating an issue that's preventing emails shared/sent via Litmus Builder from being received.

    2. May 7, 2025 at 8:37 AM UTCinvestigating

      This issue has been resolved. Any email that was not received will need to be resent from Builder.

    3. May 7, 2025 at 8:39 AM UTCresolved

      This issue has been resolved. Any email that was not received will need to be resent from Builder.

    Incoming email tests are delayed

    Started April 24, 2025 at 3:36 PM UTC · 46m

    IssuesMinor incident
    Affected components
    Litmus Application
    1. April 24, 2025 at 3:36 PM UTCinvestigating

      We are currently investigating an issue where emails sent to your Litmus test address are delayed/not arriving.

    2. April 24, 2025 at 4:22 PM UTCresolved

      This issue has been resolved. If you have not received your Litmus test already, please resend your email using your Litmus test address.

    Email Analytics Outage

    Started April 13, 2025 at 2:14 PM UTC · 7h 53m

    OutageMajor incident
    Affected components
    Email Analytics
    1. April 13, 2025 at 2:14 PM UTCinvestigating

      Email Analytics is currently down and we are not receiving data as of 9:00am EDT.

    2. April 13, 2025 at 5:05 PM UTCmonitoring

      Email Analytics processing has resumed as of 12:10pm EDT. We are monitoring, but the issue is resolved.

    3. April 13, 2025 at 10:08 PM UTCresolved

      After careful monitoring, we are now closing this incident. Original issue was resolved at 12:10pm EDT with no impact after that.

    Litmus Application slowdown

    Started December 9, 2024 at 4:34 PM UTC · 3h 12m

    IssuesMinor incident
    Affected components
    Litmus Application
    1. December 9, 2024 at 4:34 PM UTCinvestigating

      We are investigating an issue causing intermittent slowdown in the Litmus application.

    2. December 9, 2024 at 5:11 PM UTCidentified

      We've identified the issue and are working to restore Litmus as soon as possible.

    3. December 9, 2024 at 7:46 PM UTCresolved

      This issue has been resolved.

    Unable to send emails from Putsmail

    Started November 26, 2024 at 3:25 PM UTC · 1h 44m

    OutageMajor incident
    1. November 26, 2024 at 3:25 PM UTCinvestigating

      We are currently investigating an issue with sending emails from Putsmail.

    2. November 26, 2024 at 5:09 PM UTCresolved

      This incident has been resolved.

    Delay in processing incoming email tests

    Started November 14, 2024 at 2:31 PM UTC · 3h 14m

    IssuesMinor incident
    Affected components
    Litmus Application
    1. November 14, 2024 at 2:31 PM UTCinvestigating

      We are currently investigating delays in processing incoming email tests. If you are able to test using raw HTML, you can use that method in the meantime.

    2. November 14, 2024 at 3:17 PM UTCidentified

      The issue has been identified and a solution is being implemented.

    3. November 14, 2024 at 4:01 PM UTCmonitoring

      A fix has been implemented and we are monitoring the results. If your test is not showing in your account, please resend it.

    4. November 14, 2024 at 5:45 PM UTCresolved

      This incident has been resolved.

    Legacy Emails view unavailable

    Started November 14, 2024 at 5:26 AM UTC · 3h 18m

    OutageMajor incident
    Affected components
    Litmus Application
    1. November 14, 2024 at 5:26 AM UTCinvestigating

      Following database maintenance we're investigating a performance regression that's made this feature unusable.

    2. November 14, 2024 at 8:44 AM UTCresolved

      This incident has been resolved.

    iPhone 15 email previews temporarily unavailable

    Started November 13, 2024 at 8:03 PM UTC · 5d 23h

    Pending
    1. November 13, 2024 at 8:03 PM UTCidentified

      iPhone 15 email previews are currently unavailable.

    2. November 19, 2024 at 7:17 PM UTCresolved

      This incident has been resolved.

    Incoming email tests are not being processed

    Started November 1, 2024 at 1:27 PM UTC · 1h 20m

    OutageMajor incident
    Affected components
    Litmus Application
    1. November 1, 2024 at 1:27 PM UTCinvestigating

      We are currently investigating errors in processing incoming email tests. If you are able to test using raw HTML, we recommend using that method in the meantime.

    2. November 1, 2024 at 1:51 PM UTCidentified

      The issue has been identified and a fix is being implemented.

    3. November 1, 2024 at 2:24 PM UTCmonitoring

      A fix has been implemented and we are monitoring the results.

    4. November 1, 2024 at 2:47 PM UTCresolved

      This has been resolved. If you sent in a test during the impacted period, it should come through once we have caught up. You can send the test again if you prefer.

    Intermittent errors on some Personalize content types

    Started October 31, 2024 at 10:22 AM UTC · 1h 49m

    OutageMajor incident
    Affected components
    Litmus Personalize
    1. October 31, 2024 at 10:22 AM UTCinvestigating

      We are currently investigating the issue impacting some server requests. If you are seeing an error, a page refresh should help.

    2. October 31, 2024 at 11:57 AM UTCmonitoring

      A fix has been implemented and we are monitoring the results.

    3. October 31, 2024 at 12:11 PM UTCresolved

      This incident has been resolved.

    Gmail category tab tool is currently unavailable

    Started September 27, 2024 at 12:16 AM UTC · 131d 17h

    Pending
    1. September 27, 2024 at 12:16 AM UTCinvestigating

      We are currently investigating this issue.

    2. February 5, 2025 at 6:04 PM UTCresolved

      This issue has been resolved.

    Email Analytics Processing Delay

    Started July 31, 2024 at 2:33 AM UTC · 10h 47m

    IssuesMinor incident
    Affected components
    Email Analytics
    1. July 31, 2024 at 2:33 AM UTCidentified

      We are currently experiencing a delay processing Email Analytics data. The root cause is an issue with one of our hosting providers. We expect that once that issue is resolved we will fully process all data without loss.

    2. July 31, 2024 at 5:59 AM UTCmonitoring

      We’re seeing improved Email Analytics processing rates and expect that most customer data is up to date. We will keep monitoring the situation.

    3. July 31, 2024 at 1:20 PM UTCresolved

      This incident has been resolved.

    Errors on pages related to Email Analytics

    Started July 16, 2024 at 11:17 AM UTC · 1h 18m

    OutageMajor incident
    Affected components
    Litmus Application
    1. July 16, 2024 at 11:17 AM UTCinvestigating

      We are currently investigating issues in areas of the app that relate to Email Analytics. You may experience errors when loading Analytics pages or when trying to create tracking codes for example.

    2. July 16, 2024 at 11:49 AM UTCmonitoring

      A fix has been implemented and we are monitoring the results.

    3. July 16, 2024 at 12:34 PM UTCresolved

      This incident has been resolved.

    Link Check results unavailable

    Started June 20, 2024 at 3:34 PM UTC · 16h 51m

    OutageMajor incident
    Affected components
    Litmus Application
    1. June 20, 2024 at 3:34 PM UTCinvestigating

      We are currently investigating an issue with our Link Check service. In the Previews & QA tab, your results may continually load and in Email Guardian, the Links and Images section will appear as pending in the meantime.

    2. June 21, 2024 at 8:25 AM UTCresolved

      This incident has been resolved.

    Errors on pages related to Email Analytics

    Started May 15, 2024 at 9:22 AM UTC · 2h 46m

    OutageMajor incident
    Affected components
    Litmus Application
    1. May 15, 2024 at 9:22 AM UTCinvestigating

      We are currently investigating issues in areas of the app that relate to Email Analytics. You may experience errors when loading Analytics pages or when trying to create tracking codes for example.

    2. May 15, 2024 at 10:33 AM UTCmonitoring

      A fix has been implemented and we are monitoring the results.

    3. May 15, 2024 at 12:08 PM UTCresolved

      This incident has been resolved.